JP4729822B2 - Bundling wire feed mechanism for reinforcing bar binding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a binding wire feed mechanism of a reinforcing bar binding machine, and more particularly to a binding wire feed mechanism of a reinforcing bar binding machine that improves the stability of the binding wire feed.
[0002]
[Prior art]
A conventional binding wire feed mechanism of a reinforcing bar binding machine has a V-groove driven gear meshed with a V-groove drive gear driven by a feed motor, and a V-groove driven gear is attached to one end of the lever. The V-groove driven gear is elastically contacted with the V-groove drive gear by the mounted spring. If a bundling wire such as a wire is passed through the V-grooves of the two V-grooved gears, the bundling wire is sandwiched by a pair of V-grooved gears that mesh with each other, and the bundling wire is nose of the reinforcing bar binding machine by the rotation of the feed motor Sent to.
[0003]
[Problems to be solved by the invention]
In the binding wire feed mechanism of a conventional reinforcing bar binding machine in which a V-groove driven gear is elastically contacted with a single V-groove drive gear by a spring, the straightness of the binding wire wound around the binding wire reel is poor, and the traveling direction In contrast, when the left and right blurring is large, the V-grooved driven gear is pushed laterally by the binding wire and disengaged from the V-grooved driving gear, which may cause a binding wire feed failure. If the predetermined length of the binding wire is not sent, the binding process becomes defective in the twisting process, and the binding operation must be performed again, resulting in waste of the binding wire. Therefore, there is a technical problem to be solved in order to improve the stability of the bundle wire feed and prevent the occurrence of feed failure, and the present invention aims to solve the above problem.
[0004]
[Means for Solving the Problems]
The present invention is proposed to achieve the above object, and is a binding wire for a reinforcing bar binding machine in which a V-groove drive gear having a circumferential V-groove formed on an outer peripheral surface and a V-groove driven gear meshed with each other. This is a feed mechanism for a reinforcing bar binding machine in which a V-groove driven gear is elastically contacted with a V-groove drive gear by a spring and a binding wire is fed between the V-groove of the V-groove drive gear and the V-groove driven gear. In the binding wire feed mechanism,
A plurality of drive gears are arranged along the path of the binding line, and a V-groove driven gear is elastically contacted by a spring to each of the plurality of V-groove drive gears ,
Further, the plurality of V-grooved drive gears are provided in a gear holder pivotally supported by a base plate so that the gear holder can be connected even if the binding wire is separated from the upstream or downstream V-groove drive gear. The rebar tying machine is configured to maintain a state in which the downstream or upstream side V-grooved driven gear is engaged with the downstream or upstream side V-grooved driving gear. A bundling wire feeding mechanism is provided.
[0005]
A binding wire feed mechanism for a reinforcing bar binding machine in which a V-groove drive gear having a circumferential V-groove formed on the outer peripheral surface and a V-groove driven gear are meshed, and the V-groove driven gear is In a binding wire feed mechanism of a reinforcing bar binding machine that is elastically contacted to a grooved drive gear and feeds a binding wire between V grooves of a V grooved drive gear and a V groove driven gear,
A plurality of drive gears are arranged along the path of the binding wire, a plurality of V-groove driven gears are attached to one gear holder, and the gear holder is swingable and biased in the direction of the V-groove drive gear. A plurality of V-grooved driven gears are elastically contacted to the opposing V-grooved drive gears, respectively, and the gear holder swings downstream or downstream even if the binding wire is separated from the upstream or downstream V-grooved drive gear. Provided is a binding wire feed mechanism for a reinforcing bar binding machine, characterized in that the upstream V-grooved driven gear can be kept in mesh with the downstream or upstream V-grooved drive gear. Is.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 3 show a binding wire feeding mechanism 1 and a binding wire twisting mechanism 2 of a reinforcing bar binding machine, which are built in a casing (not shown) having a grip as well as a hand-held tool such as a nailing machine. A wire wound around a wire reel (not shown) is supplied to the arc nose 6 through the binding wire guide hole 5 of the cutter block 4 provided in the nose portion 3 by the binding wire feeding mechanism 1.
[0007]
FIG. 4 shows the binding wire feed mechanism 1, V-grooved drive gears 8 and 9 are arranged on the base plate 7 in the front-rear direction along the direction of travel of the wire W, and the two front and rear V-groove drive gears 8 and 9 are arranged. The V-grooved driven gears 10 and 11 are engaged with each other. The two V-groove drive gears 8 and 9 mesh with the intermediate gear 12, and the power is transmitted from the feed motor 13 through the reduction gear 14 and the intermediate gear 12, so that the two V-groove drive gears 8, 9 9 rotates synchronously.
[0008]
Two front and rear V-groove driven gears 10 and 11 are attached to a bell crank type gear holder 15. An elongated hole 16 is formed in the middle of the gear holder 15 in a direction perpendicular to the wire feeding direction. The pin 17 provided on the base plate 7 is engaged with the elongated hole 16 to swing the gear holder 15 back and forth and left and right. Holds freely. A lever 18 is attached to the base plate 7, and a front end portion of the lever 18 and a rear end portion (right end portion in the drawing) of the gear holder 15 are pin-coupled. A compression coil spring 20 is interposed between a rear end portion of the lever 18 and a spring seat 19 provided on the base plate 7, and the tip end portion of the lever 18 and the gear holder 15 are opposed to each other by the spring force of the compression coil spring 20. Energized in the direction of the grooved drive gears 8 and 9, the two V-groove driven gears 10 and 11 are elastically contacted with the V-groove drive gears 8 and 9, respectively.
[0009]
When using a reinforcing bar binding machine, if the lever 18 is rotated by pushing the rear end of the lever 18 with a finger, the gear holder 15 is retracted and the two driven gears 10 and 11 with V-grooves are provided with V-grooves. When the tip of the wire W pulled away from the drive gears 8 and 9 is passed between the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11 is released, A wire W is sandwiched between the V-grooves of the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11, and the V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11 are engaged with each other. I'm ready.
[0010]
When the straightness of the wire is poor, the V-groove driven gear 10 is pushed in the lateral direction when the upstream V-groove drive gear 8 and the V-groove driven gear 10 draw the wire. However, at this time, the gear holder 15 swings around the pin 17 as a fulcrum, and the downstream V-groove driven gear 11 remains engaged with the V-groove drive gear 9. Yes, the feeding of the wire W is continued. Further, due to local unevenness of the wire passing through the upstream V-grooved drive gear 8 and the V-groove driven gear 10, the downstream V-grooved drive gear 9 and the V-grooved driven gear 11 are engaged. Even in the case of disconnection, the upstream V-grooved driven gear 8 and the V-grooved drive gear 10 are engaged with each other, so that the wire feed does not stop.
[0011]
Next, the binding wire twist mechanism 2 will be described. As shown in FIGS. 1 and 2, the binding wire torsion mechanism 2 has two motors, a torsion motor 21 and a slide motor 22, and the torsion motor 21 drives the final gear 23 through a reduction gear train. A ball screw shaft 24 is spline-fitted into the center hole of the final gear 23. A male screw is formed at the tip of the ball screw shaft 24, and a shaft of a central clamp plate 26, which is a part of the binding wire clamp device 25, is rotatably coupled to the tip. The binding wire clamp device 25 includes a central clamp plate 26, clamp plates 27 and 28 arranged on the left and right of the central clamp plate 26, a sleeve 29 covering the three clamp plates 26, 27 and 28, and a rear end of the sleeve 29. A ball (not shown), which is composed of a fitted ball pressing ring 30 and fitted in the hole of the sleeve 29, is engaged with the male screw of the ball screw shaft 24.
[0012]
When the torsion motor 21 rotates in the forward direction, the sleeve 29 moves backward by the rotation of the ball screw shaft 24. Anti-rotation fins 31 are arranged radially on the outer periphery of the ball holding ring 30. At the foremost position, which is the initial position, the anti-rotation fins of the ball holding ring 30 are attached to the anti-rotation claw (not shown) provided in the casing. 31 is engaged, and the binding wire clamp device 25 is in a non-rotatable state.
[0013]
A shifter disk 32 that is rotatable with respect to the ball screw shaft 24 is attached to an intermediate portion of the ball screw shaft 24. The shifter disk 32 is connected to a ball pressing ring 34 screwed into the ball screw shaft 33 of the slide motor 22, and the ball screw shaft 24 and the binding wire clamp device 25 of the binding wire twisting mechanism 2 according to the rotation direction of the slide motor 22. Moves back and forth.
[0014]
The left and right clamp plates 27, 28 can slide in parallel to the left and right along the guide pins 35 provided on the central clamp plate 26, and the guide pins 36, 37 provided on the clamp plates 27, 28 are provided on the sleeve 29. It is engaged with a groove cam 38 formed on the inner peripheral surface. The groove cam 38 has a cam shape in which the left and right clamp plates 27 and 28 approach each other when the sleeve 29 is retracted, and finally the left and right clamp plates 27 and 28 sandwich the central clamp plate 26.
[0015]
Next, the operation of the reinforcing bar binding machine will be described. FIGS. 1 to 3 show an initial state. When a trigger is pulled from this state, the torsion motor 21 rotates a predetermined number of times in the forward direction, and the sleeve 29 moves backward as shown in FIG. Close lightly. The clamp plate 27 on the right side (upper in FIG. 5 (a)) as viewed from the operator is formed with a binding wire guide groove 39 serving as a wire feed path. The left clamp plate 28 is formed with a channel-shaped recess 40 reaching from the upper part to the lower end of the inner side surface, and the wire is introduced into the recess 40 of the clamp plate 28 from below in the next wire feeding step.
[0016]
Subsequently, as shown in FIG. 6, the feed motor 13 is activated, and the guide groove 39 of the right clamp plate 27 is rotated by the rotation of the two front and rear V-groove drive gears 8 and 9 and the V-groove driven gears 10 and 11. The wire W fed to the arc nose 6 through the wire bends in a loop along the inner guide groove shape of the arc nose 6, and the tip enters the recess 40 from the lower surface opening of the clamp plate 28 on the left side. Then hit the ceiling of the recess 40 and stop. The feed amount of the wire W is controlled by a control device (not shown). S is a reinforcing bar.
[0017]
After the feed motor 13 is stopped, the torsion motor 21 is started, the sleeve 29 is further retracted as shown in FIG. 7, and the left clamp plate 28 is pressed against the center clamp plate 26 to sandwich the tip of the wire W. Next, as shown in FIG. 8, the feed motor 13 is driven in reverse to pull back the wire W, and after winding the wire W around the reinforcing bar S, the feed motor 13 is driven to rotate forward as shown in FIG. Is sent out for the specified length. This is to make the amount of protrusion of the knot portion uniform by setting the twisting margin of the wire W to a constant length regardless of the thickness of the bundle of reinforcing bars to be bound.
[0018]
Then, the sleeve 29 is further retracted as shown in FIG. 10, the wire W is firmly sandwiched between the left and right clamp plates 27, 28 and the central clamp plate 26, and the slide motor 22 is driven to rotate forward as shown in FIG. The ball screw shaft 24 and the binding wire clamp device 25 are moved backward. When the binding wire clamp device 25 moves in parallel with the binding wire guide hole 5 of the cutter block 4, the wire W is sheared at the position of the guide groove 39 of the left clamp plate 27 and the sliding surface of the binding wire guide hole 5. The
[0019]
Then, as shown in FIG. 12, when the binding wire clamp device 25 is further retracted to apply tension to the wire W and the drive current reaches a specified upper limit due to an increase in the drive load of the slide motor 22, the slide motor 22 To stop. In this tensioning step, the binding wire clamping device 25 may be rotated halfway before the wire W being gripped intersects and then retracted.
[0020]
Next, since the torsion motor 21 is driven forward and the rotation-preventing fin 31 of the ball retaining ring 30 retracted from the initial position is disengaged from the rotation-preventing claw of the casing, as shown in FIG. While rotating, the slide motor 22 is driven in reverse to advance the ball screw shaft 24 and the binding wire clamp device 25, and the wire W is twisted while the binding wire clamp device 25 approaches the rebar S.
[0021]
Then, as shown in FIG. 14, when the drive current reaches a specified upper limit due to an increase in the drive load of the torsion motor 21 when the torsion is completed, or when the torsion motor 21 and the slide motor 22 Stop driving. Next, as shown in FIG. 15, the torsion motor 21 is rotated in the reverse direction, the sleeve 29 is advanced to open the left and right clamp plates 27 and 28, and the bundled wires W are released. Then, the binding wire clamp device 25 is returned to the initial position to complete one cycle of the binding operation.
[0022]
In addition, this invention is not limited to said embodiment, Although the wire was demonstrated to the example as a binding wire, wires other than a metal wire may be sufficient. Further, various modifications are possible within the technical scope of the present invention, and the present invention naturally extends to those modified ones.
[0023]
【The invention's effect】
As described above, the binding wire feeding mechanism of the reinforcing bar binding machine according to the present invention has two feeding mechanisms using V-grooved gears arranged in the front and rear in the binding wire feeding path, so the upstream side or the downstream side due to the bending of the binding wire Even if the V-grooved gear is disengaged, the downstream or upstream V-grooved gear is engaged, so the feed does not stop or become unstable, and the feed amount of the binding wire Can be controlled uniformly, and the binding performance of the reinforcing bar binding machine is improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a mechanism part of a reinforcing bar binding machine of the present invention.
FIG. 2 is a plan sectional view showing a mechanism part of the reinforcing bar binding machine of the present invention.
FIG. 3 is a front view showing a mechanism part of the reinforcing bar binding machine of the present invention.
4A and 4B show a binding wire feed mechanism of a reinforcing bar binding machine, where FIG. 4A is a front view, and FIG. 4B is a side sectional view.
5A and 5B show a binding wire path forming step of the reinforcing bar binding machine, where FIG. 5A is a plan sectional view, FIG. 5B is a front view, and FIG. 5C is a side sectional view.
6A and 6B show a binding wire feeding process, where FIG. 6A is a plan sectional view, FIG. 6B is a front view, and FIG. 6C is a side sectional view.
7A and 7B show a binding wire gripping process, where FIG. 7A is a plan sectional view, FIG. 7B is a front view, and FIG. 7C is a side sectional view.
8A and 8B show a binding wire pulling back process of the binding wire twisting mechanism, where FIG. 8A is a plan sectional view, FIG. 8B is a front view, and FIG. 8C is a side sectional view.
9A and 9B show a binding wire refeeding process, where FIG. 9A is a plan sectional view, FIG. 9B is a front view, and FIG. 9C is a side sectional view.
10A and 10B show a binding wire gripping process, where FIG. 10A is a plan sectional view, FIG. 10B is a front view, and FIG. 10C is a side sectional view.
11A and 11B show a binding wire cutting step, where FIG. 11A is a plan sectional view, FIG. 11B is a front view, and FIG. 11C is a side sectional view.
FIGS. 12A and 12B show a binding wire tension step, where FIG. 12A is a plan sectional view, FIG. 12B is a front view, and FIG. 12C is a side sectional view;
13A and 13B show a twisting process, where FIG. 13A is a front view, and FIG. 13B is a side sectional view.
14A and 14B show a twist completed state, where FIG. 14A is a plan sectional view, FIG. 14B is a front view, and FIG. 14C is a side sectional view.
15A and 15B show a binding wire opening process, where FIG. 15A is a plan sectional view, FIG. 15B is a front view, and FIG. 15C is a side sectional view.
[Explanation of symbols]
1 Bundling wire feed mechanism
2 Binding wire twisting mechanism
6 Arc nose
7 Base plate
8. 9 V-grooved drive gear
10. 11 V-grooved driven gear
12 Intermediate gear
13 Feed motor
14 Reduction gear
15 Gear holder
16 Long hole
17 pin
18 lever
19 Spring seat
20 Compression coil spring
21 Torsion motor
22 Slide motor
24 Ball screw shaft
25 Binding wire clamp device
26 Center clamp plate
27 Right clamp plate
28 Left clamp plate
29 sleeve

Claims (2)

A binding wire feed mechanism for a reinforcing bar binding machine in which a V-grooved drive gear having a circumferential V-groove formed on the outer peripheral surface and a V-groove driven gear are meshed with each other. In a binding wire feed mechanism of a reinforcing bar binding machine that is elastically contacted with a drive gear and feeds a binding wire between V grooves of a V-groove drive gear and a V-groove driven gear,
A plurality of drive gears are arranged along the path of the binding line, and a V-groove driven gear is elastically contacted by a spring to each of the plurality of V-groove drive gears ,
Further, the plurality of V-grooved drive gears are provided in a gear holder pivotally supported by a base plate so that the gear holder can be connected even if the binding wire is separated from the upstream or downstream V-groove drive gear. The rebar tying machine is configured to maintain a state in which the downstream or upstream side V-grooved driven gear is engaged with the downstream or upstream side V-grooved driving gear. Bundling wire feed mechanism. A binding wire feed mechanism for a reinforcing bar binding machine in which a V-grooved drive gear having a circumferential V-groove formed on the outer peripheral surface and a V-groove driven gear are meshed with each other. In a binding wire feed mechanism of a reinforcing bar binding machine that is elastically contacted with a drive gear and feeds a binding wire between V grooves of a V-groove drive gear and a V-groove driven gear,
A plurality of drive gears are arranged along the path of the binding wire, a plurality of V-groove driven gears are attached to one gear holder, and the gear holder is swingable and biased in the direction of the V-groove drive gear. A plurality of V-grooved driven gears are elastically contacted to the opposing V-grooved drive gears, respectively, and the gear holder swings downstream or downstream even if the binding wire is separated from the upstream or downstream V-grooved drive gear. A binding wire feed mechanism for a reinforcing bar binding machine, characterized in that the upstream V-slotted driven gear can be kept in mesh with the downstream or upstream V-slotted drive gear .

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